[PATCHv1 -next] BACKLIGHT: Backlight module for DA9052 PMIC driver

[Ashish Jangam]

Hi Richard,

Backlight Driver for Dialog Semiconductor DA9052 PMICs.

Changes made since last submission:
. read and write moved to MFD

Signed-off-by: Dajun Chen <dchen@xxxxxxxxxxx>
---
diff -Naur linux-next-20110421.orig/drivers/video/backlight/da9052_bl.c linux-next-20110421/drivers/video/backlight/da9052_bl.c
--- linux-next-20110421.orig/drivers/video/backlight/da9052_bl.c	1970-01-01 05:00:00.000000000 +0500
+++ linux-next-20110421/drivers/video/backlight/da9052_bl.c	2011-04-26 10:41:20.000000000 +0500
@@ -0,0 +1,215 @@
+/*
+ * Backlight Driver for Dialog DA9052 PMICs
+ *
+ * Copyright(c) 2009 Dialog Semiconductor Ltd.
+ *
+ * Author: Dajun Chen <dchen@xxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ */
+
+#include <linux/platform_device.h>
+#include <linux/fb.h>
+#include <linux/backlight.h>
+#include <linux/delay.h>
+
+#include <linux/mfd/da9052/da9052.h>
+#include <linux/mfd/da9052/reg.h>
+
+#define DA9052_MAX_BRIGHTNESS		0xFF
+
+enum {
+	DA9052_WLEDS_OFF,
+	DA9052_WLEDS_ON,
+	};
+
+u8 wled_bank[] = {
+			DA9052_LED1_CONF_REG,
+			DA9052_LED2_CONF_REG,
+			DA9052_LED3_CONF_REG,
+		};
+
+struct da9052_bl {
+	struct da9052 *da9052;
+	uint brightness;
+	uint state;
+	uint led_reg;
+	};
+
+static int da9052_adjust_wled_brightness(struct da9052_bl *wleds)
+{
+	u8 boost_en, i_sink;
+	int ret = 0;
+
+	boost_en = 0x3F;
+	i_sink	 = 0xFF;
+	if (wleds->state == DA9052_WLEDS_OFF) {
+		boost_en = 0x00;
+		i_sink	 = 0x00;
+	}
+
+	ret = da9052_reg_write(wleds->da9052, DA9052_BOOST_REG, boost_en);
+	if (ret < 0) {
+		dev_err(wleds->da9052->dev,
+			"Failed to write boost reg, %d\n", ret);
+		return ret;
+	}
+
+	ret = da9052_reg_write(wleds->da9052, DA9052_LED_CONT_REG, i_sink);
+	if (ret < 0) {
+		dev_err(wleds->da9052->dev,
+			"Failed to write led cont reg, %d\n", ret);
+		return ret;
+	}
+
+	ret = da9052_reg_write(wleds->da9052, wled_bank[wleds->led_reg],
+							0x0);
+	if (ret < 0) {
+		dev_err(wleds->da9052->dev,
+			"Failed to write led conf reg, %d", ret);
+		return ret;
+	}
+
+	if (wleds->brightness) {
+		msleep(10);
+		ret = da9052_reg_write(wleds->da9052,
+		wled_bank[wleds->led_reg], wleds->brightness);
+		if (ret < 0)
+			dev_err(wleds->da9052->dev,
+				"Failed to write led conf reg, %d", ret);
+	}
+
+	return ret;
+
+}
+
+static int da9052_backlight_update_status(struct backlight_device *bl)
+{
+	int brightness = bl->props.brightness;
+	struct da9052_bl *wleds = bl_get_data(bl);
+
+	wleds->brightness = brightness;
+	wleds->state = DA9052_WLEDS_ON;
+
+	return da9052_adjust_wled_brightness(wleds);
+}
+
+static int da9052_backlight_get_brightness(struct backlight_device *bl)
+{
+	struct da9052_bl *wleds = bl_get_data(bl);
+	return wleds->brightness;
+}
+
+struct backlight_ops da9052_backlight_ops = {
+	.update_status	= da9052_backlight_update_status,
+	.get_brightness	= da9052_backlight_get_brightness,
+};
+
+static int da9052_backlight_probe(struct platform_device *pdev)
+{
+	struct backlight_device *bl;
+	struct backlight_properties props;
+	int ret = 0;
+	static int led_reg_num;
+	struct da9052_bl *wleds;
+
+
+	wleds = kzalloc(sizeof(struct da9052_bl), GFP_KERNEL);
+
+	if (!wleds)
+		return -ENOMEM;
+
+	wleds->da9052	= dev_get_drvdata(pdev->dev.parent);
+	wleds->brightness = 0;
+	wleds->led_reg = led_reg_num++;
+	wleds->state = DA9052_WLEDS_OFF;
+
+	bl = backlight_device_register(pdev->name, wleds->da9052->dev,
+			wleds, &da9052_backlight_ops, &props);
+
+	if (IS_ERR(bl)) {
+		dev_err(&pdev->dev, "Failed to register backlight\n");
+		return PTR_ERR(bl);
+	}
+
+	bl->props.max_brightness = DA9052_MAX_BRIGHTNESS;
+	bl->props.brightness = 0;
+	platform_set_drvdata(pdev, bl);
+
+	ret = da9052_adjust_wled_brightness(wleds);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static int da9052_backlight_remove(struct platform_device *pdev)
+{
+	struct backlight_device *bl = platform_get_drvdata(pdev);
+	struct da9052_bl *wleds = bl_get_data(bl);
+
+	wleds->brightness = 0;
+	wleds->state = DA9052_WLEDS_OFF;
+
+	da9052_adjust_wled_brightness(wleds);
+	backlight_device_unregister(bl);
+
+	return 0;
+}
+
+static struct platform_driver da9052_wled1_driver = {
+	.driver.name	= "da9052-WLED1",
+	.driver.owner	= THIS_MODULE,
+	.probe			= da9052_backlight_probe,
+	.remove			= da9052_backlight_remove,
+};
+
+static struct platform_driver da9052_wled2_driver = {
+	.driver.name	= "da9052-WLED2",
+	.driver.owner	= THIS_MODULE,
+	.probe			= da9052_backlight_probe,
+	.remove			= da9052_backlight_remove,
+};
+static struct platform_driver da9052_wled3_driver = {
+	.driver.name	= "da9052-WLED3",
+	.driver.owner	= THIS_MODULE,
+	.probe			= da9052_backlight_probe,
+	.remove			= da9052_backlight_remove,
+};
+
+static int __init da9052_backlight_init(void)
+{
+	s32 ret;
+	ret = platform_driver_register(&da9052_wled1_driver);
+	if (ret)
+		return ret;
+	ret = platform_driver_register(&da9052_wled2_driver);
+	if (ret)
+		return ret;
+
+	ret = platform_driver_register(&da9052_wled3_driver);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+module_init(da9052_backlight_init);
+
+static void __exit da9052_backlight_exit(void)
+{
+	platform_driver_unregister(&da9052_wled1_driver);
+	platform_driver_unregister(&da9052_wled2_driver);
+	platform_driver_unregister(&da9052_wled3_driver);
+}
+module_exit(da9052_backlight_exit);
+
+MODULE_AUTHOR("Dialog Semiconductor Ltd <dchen@xxxxxxxxxxx>");
+MODULE_DESCRIPTION("Backlight driver for Dialog DA9052 PMIC");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:da9052-backlight");
+
+
diff -Naur linux-next-20110421.orig/drivers/video/backlight/Kconfig linux-next-20110421/drivers/video/backlight/Kconfig
--- linux-next-20110421.orig/drivers/video/backlight/Kconfig	2011-04-26 09:33:59.000000000 +0500
+++ linux-next-20110421/drivers/video/backlight/Kconfig	2011-04-26 10:47:08.000000000 +0500
@@ -237,6 +237,12 @@
 	  If you have a LCD backlight connected to the WLED output of DA9030
 	  or DA9034 WLED output, say Y here to enable this driver.

+config BACKLIGHT_DA9052
+	tristate "Dialog DA9052 WLED"
+	depends on PMIC_DA9052
+	help
+	  Enable the DA9052 Backlight Driver
+
 config BACKLIGHT_MAX8925
 	tristate "Backlight driver for MAX8925"
 	depends on MFD_MAX8925
diff -Naur linux-next-20110421.orig/drivers/video/backlight/Makefile linux-next-20110421/drivers/video/backlight/Makefile
--- linux-next-20110421.orig/drivers/video/backlight/Makefile	2011-04-26 09:33:59.000000000 +0500
+++ linux-next-20110421/drivers/video/backlight/Makefile	2011-04-26 10:45:49.000000000 +0500
@@ -26,6 +26,7 @@
 obj-$(CONFIG_BACKLIGHT_CARILLO_RANCH) += cr_bllcd.o
 obj-$(CONFIG_BACKLIGHT_PWM)		+= pwm_bl.o
 obj-$(CONFIG_BACKLIGHT_DA903X)	+= da903x_bl.o
+obj-$(CONFIG_BACKLIGHT_DA9052)	+= da9052_bl.o
 obj-$(CONFIG_BACKLIGHT_MAX8925)	+= max8925_bl.o
 obj-$(CONFIG_BACKLIGHT_APPLE)	+= apple_bl.o
 obj-$(CONFIG_BACKLIGHT_TOSA)		+= tosa_bl.o

Regards,
Ashish


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